- Metformin is commonly prescribed for type 2 diabetes, often alongside diet and exercise.
- Digestive upset is among the most commonly reported side effects, especially when starting.
- A rare but serious side effect called lactic acidosis is described in the official labelling.
- Do not change or stop your dose without talking to your prescriber.
What metformin is used for
According to MedlinePlus, metformin is used alone or with other medicines, including insulin, to treat type 2 diabetes. It helps control the amount of glucose in the blood. It is not used to treat type 1 diabetes.
How it is usually taken
Metformin comes as regular and extended-release tablets and as an oral liquid. How often it is taken depends on the product and on your prescriber's instructions. Follow the directions on your prescription label.
Commonly reported side effects
MedlinePlus lists side effects such as diarrhoea, nausea, stomach discomfort, gas and a metallic taste. Tell your clinician if these are severe or do not go away.
Serious safety information
The official labelling describes a rare but serious condition called lactic acidosis. Seek urgent medical help for symptoms listed in the patient information, such as unusual muscle pain, trouble breathing or unusual tiredness. Your clinician may check kidney function before and during treatment.
Is metformin available as a generic?
Yes. Metformin is widely available as a generic medicine in many countries. Availability and brand names vary by country.
Can I stop metformin if my blood sugar improves?
Do not stop or change your dose without talking to your prescriber.
Sources
- Metformin — MedlinePlus (U.S. National Library of Medicine)
- Drugs@FDA database — U.S. Food and Drug Administration